Panel



FIG. 1 is a front perspective view of a panel showing my new design;

FIG. 2 is a front elevation view of a panel;

FIG. 3 is a right elevation side view of a panel;

FIG. 4 is a left elevation side view of a panel;

FIG. 5 is a top plan view of a panel; and,

FIG. 6 is a bottom plan view of a panel.

The details shown in dashed lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a panel, as shown and described. 